Most of the researchers employed classical one factor at
a time experimental approaches by simply varying one factor
while keeping the rest constant. This procedure is time consuming
and expensive since it requires so many experiments to
be conducted in order to characterize mechanical response of
materials. However, the use of statistical experimental design
strategy provides one to quantify the main factor and the most
importantly to determine interaction effects between the main
factors. In a statistical experimental design, changes are made
to input variables of the experimental process such that the reasons
for changes in the output response could be observed so that the main and interaction effects of the process parameters
were identified.